mod. very much; urgently. : He plays to win—in a big way.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Idioms & Phrases
in a big way
To a great extent, conspicuously. For example, I could go for a hamburger in a big way, or This hotel chain is expanding in a big way. [Slang; late 1800s]